Calculator



FIG. 1 is a perspective view of the calculator;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof; and,

FIG. 6 is a bottom view thereof.

The words MARKSMAN, PF PRODUCTS, and REGISTERED DESIGN are not claimed as a feature of the mark. The numerals appearing on the display screen are not part of the design. 

The ornamental design for calculator, as shown and described. 